Sylvester Stallone humbled himself during an on-stage interview with Jonathan Ross at the London Palladium on Saturday.
Stallone admitted the success of Rocky made him "insufferable" and thinks he was "an authority on everything".
"I abused power badly," said Stallone.
"I read some of the interviews I gave now and wish I could go back and punch myself in the face," he said.
He said that after the glory following Rocky, a less-than-successful 1978 movie Paradise Alley brought him back to reality when he went to a showing of the film only to find two people in the audience.
"And one of them was asleep," he sighed.
At the event, which climaxed with the Rambo star's induction into the London Palladium Hall of Fame, Stallone took the opportunity to share some other lesser-known talents as he burst into song and read a short passage from Shakespeare's The Comedy of Errors.
Stallone currently stars with Robert De Niro in the boxing comedy Grudge Match.
Stallone spoke highly of the filming process and working out with DeNiro.
"I’ve always enjoyed working out, but this thing was pretty extraordinary," said the 67-year-old actor. "We got to prove that you don’t have to be crawling around at a certain age, or that you’re obliged to start winding down. Plus I think a lot of people, as they reach 60 and above, think, you know, I have some unfinished business."
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